Box opener



FIG. 1 is a perspective view of the box opener showing our new design;

FIG. 2 is a left side view thereof, the right side view being a mirror image of the left side view; and

FIG. 3 is front view thereof,

FIG. 4 is a rear view thereof.

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a box opener, as shown and described. 